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Exploration into the Syntheses of Gallium‐ and Indiumborates under Extreme Conditions: M 5 B 12 O 25 (OH): Structure, Luminescence, and Surprising Photocatalytic Properties
Author(s) -
Vitzthum Daniela,
Wurst Klaus,
Pann Johann M.,
Brüggeller Peter,
Seibald Markus,
Huppertz Hubert
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201804083
Subject(s) - tetragonal crystal system , luminescence , photocatalysis , gallium , doping , crystallography , materials science , catalysis , chemistry , mineralogy , crystal structure , metallurgy , optoelectronics , organic chemistry
Explorative solid‐state chemistry led to the discovery of the two new compounds Ga 5 B 12 O 25 (OH) and In 5 B 12 O 25 (OH). Extreme synthetic conditions within the range of 12 GPa and a temperature of 1450 °C realized in a Walker‐type multianvil apparatus resulted in the formation of an unprecedented tetragonal structure with the exclusive presence of condensed BO 4 tetrahedra, forming cuboctahedral cavities. Doping of these cavities with Eu 3+ in In 5 B 12 O 25 (OH) yielded in an orange–red luminescence. Photocatalytic tests of In 5 B 12 O 25 (OH) revealed a hydrogen production rate comparable to TiO 2 but completely co‐catalyst free.